RDB - Kel-Tec (Rifle Downward-eject Bullpup) is a brilliantly designed bullpup styled rifle available in 5.56 nato caliber. This would be a great tool for an EP team needing a compact designed weapon system.
The MDR [Micro Dynamic Rifle] from DesertTech is a full 16″ barrel bullpup design rifle with a forward cartridge ejection mechanism. Also features ambidextrous design with no modifications necessary. http://www.deserttacticalarms.com/
Kel-Tec RFB .308 Bullpup Rifle. Looks like an updated SA80, but this is even better, with a forward ejection system, rather than ejecting to the left or right, plus the stopping power of the .308 rather than the 5.56mm.